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United States Department of Agriculture

Agricultural Research Service

Research Project: GENETIC IMPROVEMENT OF PERENNIAL FORAGE AND TURF GRASSES FOR THE SOUTHERN UNITED STATES Title: Intergeneric pollen tube growth in Poaceae utilizing the Iap allele in Sorghum bicolor

Authors
item Bartek, Matthew -
item Rooney, William -
item Burson, Byron
item Hodnett, George -

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: July 6, 2010
Publication Date: October 31, 2010
Citation: Bartek, M., Rooney, W., Burson, B.L., Hodnett, G. 2010. Intergeneric pollen tube growth in Poaceae utilizing the Iap allele in Sorghum bicolor [abstract]. American Society of Agronomy Meetings, October 31-November 4, 2010, Long Beach, California. p. 188-23. 2010 CDROM.

Technical Abstract: The use of hybridization in sorghum (Sorghum bicolor L.) has long served as a tool utilized by breeders to increase and exploit genetic variation within the species. Recent interspecific hybridization of S. bicolor has produced diversity not previously seen within Sorghum species. A sorghum accession containing the homozygous recessive mutant gene iap (Inhibition of Alien Pollen) has been determined to remove reproductive isolation barriers. Development of a S. bicolor accession containing the mutant allele iap and ms3 has allowed introgression of genomic regions from divergent sorghum species into S. bicolor. The objectives of this study were to determine the range and effectiveness at which the iap allele allows pollen tubes of species from outside of the Sorghum genus to grow into S. bicolor pistils. Fluorescent microscopy was used to determine the distance through the pistils that foreign pollen tubes grew. Accessions from the genera of Zea, Miscanthus, Pennisetum, and Sorghastrum where used as pollen donors. Results of the study showed high levels of pollen tube growth into the ovaries of S. bicolor pistils for some species. This research shows that a wide range of intergeneric hybridization within S. bicolor may be possible through the use of the iap allele.

Last Modified: 10/19/2014
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